Ann: Pause in Trading, page-7

ASX generally pauses trading when a listed entity:

1) tells ASX it is intending to lodge a market sensitive announcement and ASX is concerned the market does not trade on an uninformed basis ahead of that announcement; or
2) requests a trading halt and ASX agrees to the request, to prevent trading occurring on an uninformed basis while the trading halt is processed.

ASX itself may also initiate a pause in trading if it is unable to contact a listed entity to discuss a query about its disclosure obligations and has reason to be concerned that trading may be about to occur, or is already occurring, on an uninformed basis.